Margaret Smith
was married at Bath to Sir Charles Bingham
, about five years older than herself, who became Baron Lucan in 1776 and Earl of Lucan in 1795.
Cokayne, George Edward. The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, extant, extinct, or dormant. Editor Gibbs, Vicary, St Catherine Press, 1910–1959, 14 vols.